> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.coperniq.io/api-reference/taxes/list-taxes/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.coperniq.io/_mcp/server.

# List Taxes

GET https://api.coperniq.io/v1/taxes

Lists tax rates configured for your company. Use these IDs when assigning taxes to quotes, invoices, and other financial documents.
The company is implied by the API key; `companyId` is not returned on each item.


Reference: https://docs.coperniq.io/api-reference/taxes/list-taxes

## Authentication

- `x-api-key` header (required) — API Key authentication via header

## Request

### Query parameters

- `include_archived` (boolean, optional, default: false) — Whether to include archived (inactive) records in the response. By default only active records are returned.
- `page` (integer, optional, default: 1) — Page number (1-based)
- `page_size` (integer, optional, default: 20) — Number of items per page (max 100)

## Response

### 200

List of company taxes (paginated)

- `list of CompanyTax`

## Errors

### 400 Bad Request Error

Invalid request

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `GRAPHQL_ERROR`
- `field` (string, optional) — Field that caused the validation error (if applicable)

### 401 Unauthorized Error

Authentication failed

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `GRAPHQL_ERROR`

### 500 Internal Server Error

Internal server error

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `GRAPHQL_ERROR`

### 502 Bad Gateway Error

Bad Gateway — downstream GraphQL service returned errors

- `message` (string, required) — Summary of the downstream service failure
- `code` (enum, required)
  - Allowed values: `GRAPHQL_ERROR`

## Types

### CompanyTax

A tax rate configured for the company.

- `id` (integer, required) — Tax identifier (use as `taxId` on quotes and invoices where supported)
- `name` (string, required) — Display name of the tax
- `rate` (string, required) — Tax rate as a percentage decimal string (e.g. "7.2500" for 7.25%)
- `isArchived` (boolean, required) — Whether this tax is archived and hidden from default listings
- `createdAt` (string, required)
- `updatedAt` (string, required)

## Examples

**Response**

```json
[
  {
    "id": 1,
    "name": "string",
    "rate": "string",
    "isArchived": true,
    "createdAt": "2024-01-15T09:30:00Z",
    "updatedAt": "2024-01-15T09:30:00Z"
  }
]
```

**SDK Code**

```python
import requests

url = "https://api.coperniq.io/v1/taxes"

headers = {"x-api-key": "<apiKey>"}

response = requests.get(url, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.coperniq.io/v1/taxes';
const options = {method: 'GET', headers: {'x-api-key': '<apiKey>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.coperniq.io/v1/taxes"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.coperniq.io/v1/taxes")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<apiKey>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.coperniq.io/v1/taxes")
  .header("x-api-key", "<apiKey>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.coperniq.io/v1/taxes', [
  'headers' => [
    'x-api-key' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.coperniq.io/v1/taxes");
var request = new RestRequest(Method.GET);
request.AddHeader("x-api-key", "<apiKey>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["x-api-key": "<apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.coperniq.io/v1/taxes")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```

> Official Coperniq API documentation. Build integrations for solar and construction project management — projects, opportunities, work orders, invoices, webhooks, and more.